Climatological large-scale circulation patterns over the Middle Americas Region
Por:
Ochoa-Moya, Carlos A., Cala-Perez, Yoel A., Diaz-Esteban, Yanet, Castro, Christopher L., Ordoñez-Peréz P., Quintanar, I, Arturo
Publicada:
1 ene 2020
Resumen:
In this study, twenty large-scale circulation patterns are identified to generate a synoptic classification ofWeather Types (WT) over a region that comprises Mexico, the Intra-Americas Seas, Central America, and northern South America. This classification is performed using Self-Organizing Maps (SOMs) with mean sea-level pressure standardized anomalies from reanalysis. The influence of quasi-permanent pressure centers over the region, such as North Atlantic Subtropical High (NASH) and North Pacific High (NPH) are well captured. Seasonal variability of high-pressure centers for dry (November-April) and wet (May-October) periods over the entire region are also well represented in amplitude and pattern among the WTs. The NASH influence and intensification of the Caribbean low-level jet and the North American monsoon system is well captured. During the dry period, a strong trough wind advects cold air masses from mid-latitudes to the subtropics over the western Atlantic Ocean. High-frequency transitions among WTs tend to cluster around the nearest neighbors in SOM space, while low-frequency transitions occur along columns instead of rows in the SOM matrix. Low-frequency transitions are related to intraseasonal and seasonal scales. The constructed catalog can identify near-surface atmospheric circulation patterns from a unified perspective of synoptic climate variability, and it is in high agreement with previous studies for the region. © 2020 by the authors.
Filiaciones:
Ochoa-Moya, Carlos A.:
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Quintanar, Arturo, I, Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico
Cala-Perez, Yoel A.:
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Mexico City 04510, DF, Mexico
Diaz-Esteban, Yanet:
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Mexico City 04510, DF, Mexico
Castro, Christopher L.:
Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, United States
Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA
Ordoñez-Peréz P.:
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Quintanar, I, Arturo:
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
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